'Flutter: How to change the icon returned by navigation?

I am new in Flutter. I want to change the icon returned by navigation.

Screen1 Code:

Navigator.push(
  context,
  MaterialPageRoute(
    builder: (context) => Screen2(),
  ),
);

Screen2 Code:

Scaffold(
  appBar: AppBar(),
  body: Container(),
),

flutter dart

Sources

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Solution	Source